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Loud exhaust pops in between shifts?

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Old Oct 25, 2006, 06:46 AM
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Loud exhaust pops in between shifts?
So ever since i got the Walboro and a re-tune, everytime i shift real fast, the car gets loud backfires...I was at the track last friday and everyone told me i was shooting orange flames out when i shifted from 1-2 and 3-4..Whats the cause for this? The car has a 11.5-11.6 A/F across the board
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Old Oct 25, 2006, 06:49 AM
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IMO, its normal.

But I am not an expert.
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Old Oct 25, 2006, 06:52 AM
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Same here. Myne started when I added my turbo back exhaust. I always thought it was because our cars run so rich it was burning the extra fuel in the exhaust.
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Old Oct 25, 2006, 06:53 AM
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It never did it before until i got a fuel pump and a retune
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Old Oct 25, 2006, 06:54 AM
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Do you find it only happens at real high rpms?
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Old Oct 25, 2006, 06:58 AM
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Originally Posted by SteveosEvo
Do you find it only happens at real high rpms?
Yes
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Old Oct 25, 2006, 07:10 AM
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same here actually got on it this morn and pop pop pop. i think it sounds mean.
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Old Oct 25, 2006, 07:13 AM
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Are you flatshifting 1/2 and 3/4?
If so then thats the reason.

High RPM, the ecu first cuts the ignition when it initially hits the limiter. Therefore overfueling occurs. Hence pop and flamage.
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Old Oct 25, 2006, 07:15 AM
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Originally Posted by Benja
Are you flatshifting 1/2 and 3/4?
If so then thats the reason.

High RPM, the ecu first cuts the ignition when it initially hits the limiter. Therefore overfueling occurs. Hence pop and flamage.
Do you mean powershifting? If so, the answer is no. I lift on every gear
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Old Oct 25, 2006, 07:24 AM
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It's just a backfire. Generally from any combination of running rich and having a big exhaust. Not having a cat makes it more pronounced.
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Old Oct 25, 2006, 07:26 AM
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Originally Posted by EVIL_EVO_VIII
Do you mean powershifting? If so, the answer is no. I lift on every gear
Sorry...yeah Powershifting/flatshifting/no-lift-to-shift....all the same thing.

I'm only guessing here, but perhaps the ecu isn't reacting quick enough too shut off injectors when you lift off, hence a little overfueling is happening since they're firing flat out at high rpm.
Only a guess though...sorry.
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Old Oct 25, 2006, 07:27 AM
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Sounds like an exhaust leak.
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Old Oct 25, 2006, 07:31 AM
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Originally Posted by spdracerut
It's just a backfire. Generally from any combination of running rich and having a big exhaust. Not having a cat makes it more pronounced.
Catless this'll happen. Seen this at the track repeatedly on other cars with stage 1 cars (exhaust/tune) that are catless when letting off at high rpms. Happens.
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Old Oct 25, 2006, 07:33 AM
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Originally Posted by spdracerut
It's just a backfire. Generally from any combination of running rich and having a big exhaust. Not having a cat makes it more pronounced.
thats exactly what it is, its very normal so don't worry!
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Old Oct 25, 2006, 07:39 AM
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Originally Posted by boostedwrx
Sounds like an exhaust leak.
I dont think so.... Did you read what i said? It started doing it after a Fuel pump install and a retune


Thanks for the imput guys!
Last edited by EVIL_EVO_VIII; Oct 25, 2006 at 07:41 AM.
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